Make it free. Obviously this should help revive downloads for those who have been charging for your app. Only one thing in touch in mind when making your app free to download, is any time you set an phone app to free for quite some period of time, the rating lessens. So we use a tendency to plan the free cycles shortly before we issue an update. You have to set the iphone app for you to paid, which stops the rare download rating of 1 star, as well as the rating gets reset for the new production.